CN112237476A

CN112237476A - High-frequency electric knife

Info

Publication number: CN112237476A
Application number: CN202011147852.5A
Authority: CN
Inventors: 孙一鸣; 郑卓容; 吴拱安
Original assignee: Sonoscape Medical Corp
Current assignee: Sonoscape Medical Corp
Priority date: 2020-10-23
Filing date: 2020-10-23
Publication date: 2021-01-19

Abstract

The invention provides a high-frequency electrotome, which comprises a sheath, a first electrode, an insulating connecting piece, a second electrode and a conductive piece, wherein the conductive piece is fixedly connected with the far end of the sheath; the first electrode is connected with the far end of the sheath and can extend out and retract along the axial direction of the sheath, and the electric connection state between the conductive piece and the first electrode is kept in a conduction state; the near end of the insulating connecting piece is connected with the far end of the first electrode; the second electrode is connected with the insulating connecting piece and comprises a conducting end positioned at the near end of the insulating connecting piece, a first gap is formed between the conducting end and the first electrode, and the first gap enables the electric connection state of the second electrode and the first electrode to be a disconnection state; when the first electrode retracts to the set position, the electric connection state between the conducting end of the second electrode and the conducting piece is switched from the off state to the on state. The invention can reduce the steps of replacing the instrument by medical care personnel in the operation process, is beneficial to shortening the operation time and relieving the pain of patients.

Description

High-frequency electric knife

Technical Field

The invention relates to the field of medical equipment, in particular to a high-frequency electrotome.

Background

The common single-stage high-frequency electrotome comprises a rod-shaped electrode and an insulator connected to the head end of the electrode, wherein the electrode can form relatively large contact resistance at the contact part with the tissue after being electrified so as to generate heat to coke or vaporize the tissue, and the insulator is used for abutting against the tissue which is not required to be cut so as to avoid the tissue from being burnt by the discharge of the head end of the electrode. Prior to tissue cutting with a high frequency electrosurgical knife, in order for an operator to accurately capture the surgical field, it is often necessary to perform a local burn on the periphery of the tissue to be cut to mark the field. Due to the fact that multiple functions such as marking and cutting need to be achieved, different instruments need to be replaced for operation in the operation process, operation time is long, and operation of doctors is complex.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a high-frequency electrotome which can shorten the operation time and relieve the pain of a patient.

The invention provides a high-frequency electrotome, comprising:

a sheath;

the conductive piece is fixedly connected with the distal end of the sheath;

a first electrode connected to the distal end of the sheath and capable of extending and retracting in the axial direction of the sheath, the conductive member and the first electrode being electrically connected to each other;

an insulating connector, a proximal end of the insulating connector being connected to a distal end of the first electrode;

the second electrode is connected with the insulating connecting piece and comprises a conducting end positioned at the near end of the insulating connecting piece, a first gap is formed between the conducting end and the first electrode, and the first gap enables the electric connection state of the second electrode and the first electrode to be an off state;

when the first electrode retracts to the set position, the electric connection state between the conducting end of the second electrode and the conducting piece is switched from the off state to the on state.

Further, the conductive member is a revolving body surrounding the outer side of the first electrode.

Further, one of the conductive member and the first electrode has a protruding portion which is in sliding contact with the other, and a part of a hole wall of a first through hole through which the first electrode passes is in sliding contact with the first electrode by the conductive member.

Further, one of the conductive member and the first electrode has a plurality of protrusions which are in sliding contact with the other, and the plurality of protrusions are distributed in the circumferential direction so as to form a gap between a hole wall of a first through hole through which the first electrode passes in the conductive member and the first electrode.

Further, the other one of the conductive member and the first electrode has a slide groove extending in an axial direction of the first electrode, and the protrusion is located in the slide groove.

The rolling part is respectively contacted with the first electrode and the conductive part and can roll relative to the first electrode and the conductive part, and part of the hole wall of the first through hole, through which the first electrode passes, of the conductive part is in sliding contact with the first electrode.

The rolling parts are respectively contacted with the first electrode and the conductive part and can roll relative to the first electrode and the conductive part, and the rolling parts are distributed along the circumferential direction so as to form a gap between the hole wall of the first through hole for the first electrode to pass through and the first electrode in the conductive part.

Further, the other of the first electrode and the conductive member has a rolling groove extending in an axial direction of the first electrode, and the rolling member is embedded in the rolling groove.

Further, still include insulating isolator, insulating isolator connect in the distal end of sheath, encircle in first electrode and have the annular, electrically conductive piece imbeds in the annular.

Further, the conducting end is offset from an axis of the first electrode.

The third electrode is connected with the far end of the first electrode, the revolving body takes the axis of the first electrode as a revolving shaft, and a second gap is formed between the third electrode and the conducting end.

Further, the conducting end is a revolving body which surrounds the outer side of the first electrode.

Further, the conductive member extends in a radial direction of the first electrode and is in sliding contact with the first electrode.

Further, the conductive member is in contact with the first electrode and can roll relative to the first electrode.

Further, the electrode comprises a plurality of conductive pieces which are uniformly distributed along the circumferential direction of the first electrode.

Further, the conductive piece and the first electrode are in sliding contact and/or rolling contact.

Further, the second electrode further comprises a working end located at a distal end of the insulating connector.

Further, the insulating connecting piece is a revolving body which takes the axis of the first electrode as a revolving shaft, and the working end is positioned in the center of the far end of the insulating connecting piece.

Further, the insulating connecting member is a revolving body which takes the axis of the first electrode as a revolving axis, and the second electrode is a linear electrode and is deviated from the center of the insulating connecting member.

Has the advantages that:

the electrotome is provided with the second electrode positioned at the distal end part, the second electrode can realize the switching of the electrified state through the movement of the first electrode, and when the second electrode is not electrified, the second electrode can directly contact human tissues, so that the first electrode is prevented from causing unnecessary damage to tissues at other parts under the working state (such as cutting the tissues); when the second electrode is electrified, the second electrode can perform operations such as marking and the like, so that the steps of replacing appliances by medical staff in the operation process can be reduced, the operation time can be shortened, and the pain of a patient can be relieved.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a perspective view of a high-frequency electric knife according to a first embodiment of the present invention;

FIG. 2 is an exploded view of the high frequency electrotome of FIG. 1;

FIG. 3 is a cross-sectional view of the high frequency electrotome of FIG. 1;

FIG. 4 is a partial cross-sectional view of the high frequency electric knife of FIG. 1 in a retracted state;

FIG. 5 is a perspective view of a conductive member according to a second embodiment of the present invention;

fig. 6 is a cross-sectional view of a conductive member coupled to a first electrode in accordance with a second embodiment of the present invention;

fig. 7 is a sectional view showing a conductive member connected to a first electrode according to a third embodiment of the present invention;

fig. 8 is a sectional view showing a conductive member connected to a first electrode according to a fourth embodiment of the present invention;

fig. 9 is a cross-sectional view showing a conductive member connected to a first electrode according to a fifth embodiment of the present invention;

fig. 10 is a sectional view showing a conductive member connected to a first electrode according to a sixth embodiment of the present invention;

fig. 11 is a sectional view showing a conductive member connected to a first electrode according to a seventh embodiment of the present invention;

fig. 12 is a sectional view showing a conductive member connected to a first electrode according to an eighth embodiment of the present invention;

fig. 13 is a sectional view showing a conductive member connected to a first electrode according to a ninth embodiment of the present invention;

fig. 14 is a partial sectional view showing the high-frequency electric knife in a retracted state in the tenth embodiment of the invention;

fig. 15 is a cross-sectional view of a conductive member, a first electrode and an insulating spacer in a tenth embodiment of the invention;

FIG. 16 is a perspective view of a twelfth embodiment of the high frequency knife showing the proximal end of the insulated connector of the present invention;

FIG. 17 is a perspective view of the proximal end of a high frequency electrosurgical display extension in accordance with another embodiment of the present invention;

fig. 18 is a partial sectional view showing a retracted state of the high-frequency electric knife in the thirteenth embodiment of the invention.

Detailed Description

The concept and technical effects of the present invention will be clearly and completely described below in conjunction with the embodiments to fully understand the objects, features and effects of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and those skilled in the art can obtain other embodiments without inventive effort based on the embodiments of the present invention, and all embodiments are within the protection scope of the present invention.

In the description of the embodiments of the present invention, if an orientation description is referred to, for example, the orientations or positional relationships indicated by "upper", "lower", "front", "rear", "left", "right", etc. are based on the orientations or positional relationships shown in the drawings, only for convenience of describing the present invention and simplifying the description, but not for indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

In the description of the embodiments of the present invention, if a feature is referred to as being "disposed", "fixed", "connected", or "mounted" to another feature, it may be directly disposed, fixed, or connected to the other feature or may be indirectly disposed, fixed, connected, or mounted to the other feature. In the description of the embodiments of the present invention, if "a number" is referred to, it means one or more, if "a plurality" is referred to, it means two or more, if "greater than", "less than" or "more than" is referred to, it is understood that the number is not included, and if "greater than", "lower" or "inner" is referred to, it is understood that the number is included. If reference is made to "first" or "second", this should be understood to distinguish between features and not to indicate or imply relative importance or to implicitly indicate the number of indicated features or to implicitly indicate the precedence of the indicated features.

In the related art, the distal end portion of the electric knife is usually an insulator, and the marking operation cannot be performed, so that other instruments need to be replaced during the operation, resulting in an increase in the operation time and increased pain of the patient. In view of the above, the present invention provides a high-frequency monopolar electric knife having a first electrode and a second electrode, the second electrode being located at a distal end of the electric knife, and when the second electrode is disconnected from the first electrode, cutting or the like can be performed using the first electrode, and the second electrode can contact human tissue without causing damage; when the second electrode is in conduction with the first electrode, a marking or the like can be performed using the second electrode.

The high-frequency monopolar electric knife according to the embodiment of the invention is specifically described below with reference to fig. 1 to 4.

First embodiment

In some embodiments of the present invention, the high-frequency electric knife includes a first electrode 100, a second electrode 200, a sheath 300, an insulating connecting member 400 and a conductive member 500, wherein the first electrode 100 is connected to a distal end of the sheath 300 and can be extended and retracted in an axial direction of the sheath 300. The proximal end of the insulating connector 400 is connected to the first electrode 100, and the second electrode 200 is connected to the insulating connector 400, so that the first electrode 100, the second electrode 200 and the insulating connector 400 can move synchronously. The second electrode 200 includes a conducting end 210 at the proximal end of the insulating connector 400, with a first gap 101 between the conducting end 210 and the first electrode 100, the first gap 101 enabling the electrical connection of the first electrode 100 to the second electrode 200 to be in an open state when the first electrode 100 is not retracted. The conductive member 500 is connected to the distal end of the sheath 300, and the electrical connection state between the conductive member 500 and the first electrode 100 is a conduction state.

When the first electrode 100 is not retracted (for example, in the state shown in fig. 1), the conducting terminal 210 is in an off state with respect to the first electrode 100, and no current passes through the second electrode 200, so that operations such as cutting can be performed through the first electrode 100; when the first electrode 100 is retracted to a predetermined position (for example, in the state shown in fig. 4), the conducting terminal 210 and the first electrode 100 are switched from the off state to the on state, and the current can be transmitted from the first electrode 100 to the second electrode 200 through the conductive member 500, and at this time, a marking operation or the like can be performed through the second electrode 200.

As used herein, "distal" refers to the end that is relatively far from the operator, "proximal" refers to the end that is relatively close to the operator, and "distal" and "proximal" are used for relative position and are not meant to be limiting as to the end faces of the members. When referring to "axial" and "radial" of a member, this is for the purpose of illustrating the extension or movement tendency of the member and is not meant to limit the member to a cylinder. When referring to the "axis" of a component, it may refer to the rotation axis of the rotation body, or may refer to the symmetry axis of an axisymmetric or centrosymmetric structure, or may refer to the rotation axis or symmetry axis of a corresponding part when a part of the structure on the component is a rotation structure, an axisymmetric or centrosymmetric structure. The "conducting state" refers to a state that high-frequency current passes through the members and meets the working requirements of the electrode, and includes a case that the members are contacted with each other or a gap between the members is smaller than a set value (since the high-frequency electrotome works by using alternating current, when the gap is small enough, the high-frequency electrotome can pass through the current with enough intensity, and the electrode can realize the functions of marking and the like after being conducted); the "off state" refers to a state in which a current is blocked from passing or a current passing through is extremely weak. (of course, considering the gap and the conductors on both sides as capacitors, in addition to the distance, it is necessary to consider the relative area of the conductors and the effect of the material in the gap on the magnitude of the current, as will be mentioned later.)

Specifically, the sheath 300 may be a circular tube made of an insulating material, the first electrode 100 may be a long rod-shaped electrode, the first electrode 100 is inserted into the sheath 300, and the whole first electrode 100 may move along the axial direction of the sheath relative to the sheath 300. When the first electrode 100 is in the state shown in fig. 1, the distal end of the first electrode 100 is located outside the sheath 300, and cutting of tissue can be performed after the power is applied. When the first electrode 100 is in the state shown in fig. 4, the first electrode 100 is located almost entirely or entirely within the sheath 300. The proximal end of the first electrode 100 may be connected to a wire cable 120 via a conductive connection 110 (e.g., a sleeve in fig. 3), the proximal end of the wire cable 120 may be connected to a not-shown operating handle, and an operator may control the axial movement of the first electrode 100 via the operating handle and the wire cable, and at the same time, a not-shown power source may supply power to the first electrode 100 via the wire cable.

The electric knife of the embodiment is provided with the second electrode 200 positioned at the distal end part, the second electrode 200 can realize the switching of the electrified state through the axial movement of the first electrode 100, when the second electrode 200 is not electrified, the second electrode 200 can directly contact human tissues, and unnecessary damage to tissues at other parts caused by the first electrode 100 in use is avoided; when the second electrode 200 is powered on, the second electrode 200 can perform operations such as marking, so that the steps of replacing instruments by medical staff in the operation process can be reduced, the operation time can be shortened, and the pain of a patient can be relieved.

In the above-mentioned electrotome, the conductive member 500 and the first electrode 100 are in contact with each other to maintain a conductive state, and the contact relationship between the conductive member 500 and the first electrode 100 may be sliding contact, rolling contact, or both sliding contact and rolling contact, so that the first electrode 100 can rotate or move relative to the conductive member 500 while ensuring the conduction between the conductive member and the first electrode. The term "sliding contact" as used herein means that the two members can move relative to each other while being kept in contact with each other. By "rolling contact" as it is meant herein, two members are in direct contact and at least one of the two members is capable of rolling relative to the other; or the two members are respectively in contact with a rolling member capable of conducting electricity, and the rolling members can respectively roll relative to the two members.

Second embodiment

Referring to fig. 2, this embodiment is a specific solution based on the first embodiment, in this embodiment, the conductive member 500 is a revolving body surrounding the outer side of the first electrode 100, such as an annular conductive sheet shown in the figure, and the first electrode 100 passes through the first through hole 510 on the conductive member 500, so that the second electrode 200 can be conducted with the conductive member 500 when rotating to any angle relative to the sheath 300. One of the conductive member 500 and the first electrode 100 has a protrusion in sliding contact with the other, and a part of the hole wall 520 of the first through hole 510, through which the first electrode 100 passes, of the conductive member 500 is in sliding contact with the first electrode 100, so that the conduction between the first electrode 100 and the conductive member 500 can be realized, and the contact area between the first electrode 100 and the conductive member 500 can be reduced, thereby reducing the friction force therebetween and facilitating the rotation or axial movement of the first electrode 100.

Specifically, referring to fig. 5 and 6, a first protrusion 530 radially protrudes from the hole wall 520 of the first through hole 510, and the first electrode 100 may be a long rod-shaped electrode with a circular cross section. The plurality of first protrusions 530 are distributed along the circumferential direction of the first through hole 510, and the first electrode 100 is in sliding contact with each first protrusion 530, so that a gap 540 is formed between the hole wall 520 of the first through hole 510 and the first electrode 100, that is, in the embodiment, the first electrode 100 does not contact the hole wall 520 of the first through hole 510, and the conduction with the conductive member 500 is realized only by the contact of the first protrusions 530.

The first protrusion 530 has a rounded end 531 at an end toward the first electrode 100, and the rounded end 531 may further reduce a contact area between the first protrusion 530 and the first electrode 100. In the present embodiment, four first protrusions 530 are provided, each first protrusion 530 is uniformly distributed along the circumferential direction of the first through hole 510, and the radial dimensions of each first protrusion 530 are equal, so that the first electrode 100 can be held at the center position of the first through hole 510. It can be understood that three or other numbers of first protrusions 530 may be provided on the conductive member 500.

In this embodiment, the electric knife further includes an insulating spacer 700, the insulating spacer 700 is connected to the distal end of the sheath 300, surrounds the first electrode 100 and has a ring groove 710, and the conductive member 500 is embedded in the ring groove 710 to achieve the installation and fixation of the conductive member 500.

Specifically, the insulating spacer 700 includes a first connection portion 720 and a second connection portion 730, the first connection portion 720 and the second connection portion 730 are circular tubes, and the diameter of the first connection portion 720 is larger than that of the second connection portion 730. The first connection portion 720 is located at the outside of the sheath 300, the second connection portion 730 is located at the inside of the sheath 300, the insulating barrier 700 is connected by the sheath 300 of the first connection portion 720 and/or the second connection portion 730, and the first electrode 100 passes through a passage in the insulating barrier 700.

The end face of the distal end of the first connecting portion 720 has a ring groove 710, and the conductive member 500 is embedded in the ring groove 710 and fixed by bonding, clamping, or the like. The distal end surface of the conductive member 500 may protrude from the distal end surface of the first connection portion 720 so as to contact the conductive end 210, or may be flush with the distal end surface of the first connection portion 720. In the embodiment, the conductive member 500 is disposed in the annular groove 710 on the distal end surface of the insulating spacer 700, so that the conductive member 500 can be conducted with the conducting end 210 and the third electrode 800, and unnecessary damage caused by the contact of the conductive member 500 with human tissue can be avoided.

Third embodiment

Referring to fig. 7, the present embodiment is an alternative solution based on the second embodiment, and the differences from the second embodiment include: the first electrode 100 can be in sliding contact with a part of the hole wall 520 of the first through-hole 510, in addition to the first projection 530. Specifically, in this embodiment, three first protrusions 530 radially extend from the hole wall 520 of the first through hole 510, the three first protrusions 530 are substantially located on one side of the first electrode 100, and the other side of the first electrode 100 contacts with a part of the hole wall 520 of the first through hole 510, so that the resistance of the first electrode 100 in rotation or movement can be reduced on the basis of ensuring the conduction between the two. It can be understood that two or other numbers of first protrusions 530 may be disposed on the hole wall 520 of the first through hole 510.

Fourth embodiment

Referring to fig. 8, the present embodiment is an alternative solution based on the second embodiment, and the differences from the second embodiment include: the plurality of second protrusions 140 are circumferentially disposed on the first electrode 100, the second protrusions 140 extend in the radial direction of the first electrode 100, and each second protrusion 140 is in contact with the hole wall 520 of the first through hole 510, so as to form a gap 540 between the outer side wall of the first electrode 100 and the hole wall 520, thereby reducing the resistance of the first electrode 100 during rotation or movement on the basis of ensuring the conduction between the two. It can be appreciated that the second protrusion 140 has a rounded end 141 toward one end of the conductive member 500, and the rounded end 141 may further reduce a contact area between the first protrusion 530 and the first electrode 100.

Fifth embodiment

Referring to fig. 9, the present embodiment is an alternative solution based on the second embodiment, and the differences from the second embodiment include: the first electrode 100 has a second protrusion 140 extending radially therefrom, and the conductive member 500 can be in sliding contact with part of the outer side wall of the first electrode 100 in addition to the second protrusion 140. Specifically, the first electrode 100 extends a second protrusion 140, the second protrusion 140 contacts with a part of the hole wall 520 of the first through hole 510, and a part of the outer side wall of the first electrode 100, which is opposite to the second protrusion 140, also contacts with another part of the hole wall 520 of the first through hole 510, so that the gap 150 is formed at two sides of the second protrusion 140, and thus, on the basis of ensuring the conduction between the two, the resistance of the first electrode 100 in rotation or movement can be reduced.

When the first electrode 100 has the shape shown in fig. 9, the axis of the first electrode 100 is the axis of the circular rod portion.

Sixth embodiment

Referring to fig. 10, this embodiment is a modified version of the second embodiment, and the differences from the second embodiment include: the first electrode 100 is provided with a sliding groove 130 extending along the axial direction, the first protrusion 530 extends into the sliding groove 130, and a groove wall of the sliding groove 130 can guide the first protrusion 530. The number of the sliding grooves 130 may be equal to that of the first protruding portion 530, for example, four sliding grooves 130 are uniformly distributed along the circumferential direction of the first electrode 100 in the drawing. The number of the sliding grooves 130 may also be less than that of the first protrusions 530, for example, only one sliding groove 130 is provided to be matched with one first protrusion 530, and the other first protrusions 530 still are in sliding contact with the side wall of the first electrode 100.

It can be understood that the scheme of guiding the protrusion and the sliding groove can be applied to the third to fifth embodiments, when the protrusion is provided on one of the conductive member 500 and the first electrode 100, the sliding groove is provided on the other.

Seventh embodiment

Referring to fig. 11, this embodiment is a specific solution based on the first embodiment, in this embodiment, the conductive member 500 is also a revolving body surrounding the outer side of the first electrode 100, such as an annular conductive sheet shown in the figure, and the first electrode 100 passes through the first through hole 510 on the conductive member 500, so that the second electrode 200 can be conducted with the conductive member 500 when rotating to any angle relative to the sheath 300. The electric knife of this embodiment further includes a plurality of rolling members 600, each rolling member 600 is located between the first electrode 100 and the conductive member 500, is in contact with the first electrode 100 and the conductive member 500, and can roll relative to the first electrode 100 and the conductive member 500. The rolling members 600 are circumferentially distributed to form a gap 540 between the hole wall 520 of the first through hole 510 and the first electrode 100, so that the resistance of the first electrode 100 in rotation or movement can be reduced on the basis of ensuring the conduction between the first electrode 100 and the conductive member 500.

Specifically, the rolling member 600 may be a ball, the hole wall 520 of the first through hole 510 is provided with a plurality of spherical grooves 550, and the opening of the groove 550 is smaller than the diameter of the rolling member 600, so that the rolling member 600 can be exposed from the opening portion and cannot be separated from the groove 550. It can be appreciated that the rolling member 600 may also be a cylinder.

Eighth embodiment

Referring to fig. 12, this embodiment is an alternative to the sixth embodiment, and the differences from the sixth embodiment include: the first electrode 100 can be in sliding contact with a part of the hole wall 520 of the first through-hole 510, in addition to being in contact with the rolling member 600. Specifically, in the present embodiment, two rolling members 600 are provided, the two rolling members 600 are approximately located on one side of the first electrode 100, and the other side of the first electrode 100 is in contact with a part of the hole wall 520 of the first through hole 510, so that the resistance of the first electrode 100 in rotation or movement can be reduced on the basis of ensuring the conduction between the first electrode 100 and the conductive member 500.

Ninth embodiment

Referring to fig. 13, this embodiment is a modified version of the seventh embodiment, and the differences from the sixth embodiment include: the first electrode 100 is provided with a sliding groove 130 extending along the axial direction, the rolling member 600 extends into the sliding groove 130, and the groove wall of the sliding groove 130 can guide the rolling member 600. The number of the sliding grooves 130 may be equal to that of the rolling members 600, for example, four sliding grooves 130 are uniformly distributed along the circumferential direction of the first electrode 100. The number of runners 130 may also be smaller than the number of rolling elements 600, e.g. only runners 130 cooperating with one rolling element 600 are provided, the other rolling elements 600 still being in sliding contact with the side wall of the first electrode 100.

It is understood that the roller 600 and the chute guide scheme can be applied to the eighth embodiment.

Tenth embodiment

Referring to fig. 14 and fig. 15, this embodiment is a specific solution based on the first embodiment, and the conducting end 210 of the second electrode 200 is a revolving body surrounding the outer side of the first electrode 100, so as to ensure that the second electrode 200 can conduct with the conducting member 500 when rotating to any angle relative to the sheath 300. Specifically, the insulating connection member 400 includes a third connection portion 410 and a fourth connection portion 420, wherein the third connection portion 410 is cylindrical and located inside the second electrode 200, and is used for connecting the conducting terminal 210 and the first electrode 100, and the conducting terminal 210 and the first electrode 100 are not in contact with each other. The fourth connection portion 420 is sleeved on the outer side of the second electrode 200 and fixed by bonding or the like, thereby covering the main structure of the second electrode 200.

The conductive member 500 may be a rotating body in the above embodiment, or may be a non-rotating body as shown in fig. 14, specifically, the conductive member 500 may be a conductive block extending along the radial direction of the first electrode 100, and along the radial direction of the first electrode 100, one end of the conductive member 500 is fixedly connected to the insulating spacer 700 and the like, and the other end is in contact with the first electrode 100; the conductive member 500 can contact the conducting terminal 210 in the axial direction of the first electrode 100. The first electrode 100 is simultaneously contacted with a part of the hole wall of the through hole of the insulating spacer 700 for the first electrode 100 to pass through, so that the resistance of the first electrode 100 in rotation or movement is reduced on the basis of ensuring the conduction between the first electrode 100 and the conductive member 500.

Eleventh embodiment

This embodiment is an alternative to the tenth embodiment, and the differences from the tenth embodiment include: the conductive member 500 is a rotating member such as a ball, and along the radial direction of the first electrode 100, the conductive member 500 contacts the first electrode 100 and can roll with respect to the first electrode 100; the conductive member 500 can contact the conducting terminal 210 in the axial direction of the first electrode 100. The first electrode 100 may contact with the conductive member 500 and a part of the hole wall of the through hole of the insulating spacer 700 through which the first electrode 100 passes. It is also possible to provide a plurality of conductive members 500 arranged along the circumferential direction of the first electrode 100, and the first electrode 100 is in contact with each conductive member 500, respectively, so that a gap is formed between the first electrode 100 and a part of the wall of the through hole of the insulating spacer 700 through which the first electrode 100 passes.

Twelfth embodiment

Referring to fig. 3, this embodiment is a specific solution based on the first embodiment, in this embodiment, when the conductive member 500 is a rotator, the conducting end 210 is deviated from the axis of the first electrode 100, so that the connection between the first electrode 100, the second electrode 200 and the insulating connecting member 400 can be realized on the basis of avoiding the interference between the first electrode 100 and the conducting end 210. Specifically, the first electrode 100 is a rod-shaped electrode with a circular cross section, the sheath 300 is a circular tube, and the proximal end of the first electrode 100 is inserted into the sheath 300 and is coaxial with the sheath 300. The conducting end 210 is axially parallel to the first electrode 100 and is offset from the axis of the first electrode 100 by a set distance.

Referring to fig. 1-4, in this embodiment, the second electrode 200 further includes a working end 220, and the working end 220 is located at the distal end of the insulating connector 400 and is used for performing marking and other operations after the second electrode 200 is powered on. Specifically, the working end 220 extends from the distal end of the insulating connector 400, and when the second electrode 200 is not energized, the working end 220 can directly contact human tissue; when the second electrode 200 is energized, the working end 220 located at the most distal end of the entire electrotome can conveniently perform marking and the like.

In this example, the working end 220 is conical, and the conical shape of the working end 220 facilitates increasing the current density at the interface to increase the efficiency of tissue marking. It will be appreciated that the working end 220 may also be cylindrical, with the cylindrical working end 220 facilitating machining. Further, referring to fig. 14, the working end 220 may also be a hemisphere, the working end 220 being located at the center of the insulating connector 400. Specifically, the insulating connecting member 400 has a mounting cavity 450 inside, the mounting cavity 450 includes a first cavity and a second cavity sequentially arranged along a direction from the distal end to the proximal end, the first cavity forms a first opening at the distal end of the insulating connecting member 400, the working end 220 is exposed from the first opening, the second cavity forms a second opening at the proximal end of the insulating connecting member 400, and the conducting end 210 is exposed from the second opening, so that the main structure of the second electrode 200 is located in the mounting cavity 450, and is coated by the insulating connecting member 400 to avoid contacting with external tissues, the working end 220 is exposed from the first opening at the distal end of the mounting cavity 450 to perform operations such as marking, and the conducting end 210 is exposed from the second opening at the proximal end of the mounting cavity 450 to facilitate conducting with the conducting member 500.

Referring to fig. 2, in this embodiment, the insulating connector 400 is a solid of revolution about the axis of the first electrode 100, and the working end 220 is located at the center of the distal end of the insulating connector 400. Specifically, the second electrode 200 is a bent electrode, that is, the working end 220 of the second electrode 200 is not coaxial with the conducting end 210, so that on the basis of ensuring that the conducting end 210 deviates from the axis of the first electrode 100, the working end 220 can be located at the center of the distal end of the insulating connecting member 400, and even if the insulating connecting member 400 rotates, the working end 220 does not deviate from the operating position. And since the working end 220 is located at the center of the insulating connector 400, the insulating connector 400 may be a sphere, a hemisphere or a cone, that is, the radial section of the insulating connector 400 is gradually reduced along the extending direction of the first electrode 100, so that the insulating connector 400 can conveniently enter the inside of the tissue.

Referring to fig. 4, 16 and 17, in the present embodiment, the electrotome further includes a third electrode 800, the third electrode 800 is connected to the distal end of the first electrode 100 and is a rotator with the axis of the first electrode 100 as the rotation axis, and a second gap 102 is formed between the third electrode 800 and the conducting end 210.

Specifically, the third electrode 800 is an annular conductive sheet and is connected to the proximal end of the insulating connector 400, and the third electrode 800 and the insulating connector 400 can be connected by adhesion to simplify the connection structure therebetween, for example, the proximal end surface of the insulating connector 400 has a positioning groove 430, and a positioning post 810 extends from the distal end surface of the third electrode 800, and when the third electrode 800 and the insulating connector 400 are installed, the positioning post 810 is inserted into the positioning groove 430 to position the third electrode 800 and the insulating connector 400, and then the third electrode 800 and the insulating connector 400 are connected by an adhesive. After the second electrode 200 and the insulating connector 400 extend into the mucosa, the outer edge of the third electrode 800 can be cut from the inner side of the mucosa, so that the cutting mode of the electric knife is increased.

The third electrode 800 has a second through hole 820, the conducting terminal 210 passes through the second through hole 820, and a second gap 102 is formed between the wall of the second through hole 820 and the conducting terminal 210, so as to prevent the conducting terminal 210 from directly contacting the third electrode 800. In addition, the second via 820 extends to the outer sidewall of the third electrode 800 in the radial direction of the third electrode 800 and forms an opening on the outer sidewall, and the third electrode 800 forms a sharp part 830 at the edge of the opening, and the sharp part 830 may discharge a large amount due to the "tip skin effect" of the current, so that the cutting efficiency can be improved.

Referring to fig. 17, in the present embodiment, the extension portion 440 extends from the proximal end surface of the insulating connector 400, and the extension portion 440 is at least filled in the second gap 102 between the conducting end 210 and the third electrode 800, so as to enhance the current blocking capability. The extension portion 440 may surround the lead-through end 210 in a circumferential direction of the lead-through end 210. In this embodiment, the conducting terminal 210 and the third electrode 800 are insulated by the extension portion 440 of the insulating connector 400, and a separate spacer is not required, which is helpful to reduce the number of components and assembly steps. It is understood that a separate member separated from the insulating connector 400 may be used for insulation isolation. The insulating structure such as the extension portion 440 is filled in the second gap 102, so that the dielectric constant in the second gap 102 can be reduced to prevent an excessive current from being coupled from the third electrode 800 to the conducting terminal 210, thereby ensuring that the second electrode 200 is insulated from the first electrode 100 as much as possible when the second electrode 200 is not used for marking or the like (i.e., when the first electrode 100 is extended), and preventing unnecessary damage to non-target tissues. In addition, in the structural design of the embodiments of the present application, the specific shape thereof also ensures that the relative area of the conductors on both sides of the second gap 102 is small enough to further reduce the current in the second electrode 200 in the non-operating state.

Thirteenth embodiment

Referring to fig. 18, the present embodiment is an alternative on the basis of the twelfth embodiment, and the differences from the twelfth embodiment include: the second electrode 200 is a linear electrode and is offset from the center of the insulating connector 400. The "linear electrode" referred to in this application means that the axis of the electrode is a straight line and does not bend, so as to ensure that the working end 220 of the second electrode 200 is coaxial with the conducting end 210, and thus, the second electrode 200 does not need to bend, and the installation cavity 450 of the insulating connecting member 400 can be a straight hole, which can reduce the processing difficulty. In order to avoid interference between the conducting terminal 210 and the first electrode 100, the second electrode 200 is entirely offset from the center of the insulating connecting member 400, and since the insulating connecting member 400 has a small diameter, the offset of the working terminal 220 from the center of the insulating connecting member 400 is small, and even if the insulating connecting member 400 is rotated during use, the offset of the working terminal 220 from the operating position is within an acceptable range.

In this embodiment, the main body of the second electrode 200 is cylindrical, i.e. the cross-sectional area remains constant, it being understood that the cross-sectional area of the second electrode 200 may also vary, e.g. gradually increasing in the proximal to distal direction.

In this embodiment, the insulating connector 400 may be a cylinder or a structure similar to a cylinder, so as to ensure that the insulating connector 400 can still cover the main structure of the second electrode 200 on the basis that the second electrode 200 is entirely deviated from the center of the insulating connector 400.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention. Furthermore, the embodiments of the present invention and the features of the embodiments may be combined with each other without conflict.

Claims

1. High frequency electrotome, characterized in that comprises:

a sheath;

the conductive piece is fixedly connected with the distal end of the sheath;

2. The high-frequency electrotome according to claim 1, wherein said conductive member is a solid of revolution surrounding the outside of said first electrode.

3. The high-frequency electric knife according to claim 2, wherein one of the conductive member and the first electrode has a projection which is in sliding contact with the other, and a part of a hole wall of a first through hole through which the first electrode passes by the conductive member is in sliding contact with the first electrode.

4. The high-frequency electric knife according to claim 2, wherein one of the conductive member and the first electrode has a plurality of projections in sliding contact with the other, the plurality of projections being distributed circumferentially to form a gap between a hole wall of a first through hole through which the first electrode passes in the conductive member and the first electrode.

5. The high-frequency electric knife according to claim 3 or 4, wherein the other of the conductive member and the first electrode has a slide groove extending in an axial direction of the first electrode, the projection being located in the slide groove.

6. The high-frequency electric knife according to claim 2, further comprising rolling members which are in contact with and capable of rolling relative to the first electrode and the conductive member, respectively, and a part of a hole wall of the first through hole through which the first electrode passes is in sliding contact with the first electrode.

7. The high-frequency electric knife according to claim 2, further comprising a plurality of rolling members, each of which is in contact with and capable of rolling with respect to the first electrode and the conductive member, respectively, the plurality of rolling members being distributed in a circumferential direction so as to form a gap between a hole wall of a first through hole through which the first electrode passes in the conductive member and the first electrode.

8. The high-frequency electric knife according to claim 6 or 7, wherein the other of the first electrode and the conductive member has a rolling groove extending in an axial direction of the first electrode, the rolling member being embedded in the rolling groove.

9. The high frequency electrotome according to claim 2, further comprising an insulating spacer connected to the distal end of the sheath, surrounding the first electrode and having an annular groove, the conductive member being embedded in the annular groove.

10. The high frequency electrotome according to claim 2, wherein the conducting end is offset from the axis of the first electrode.

11. The electrosurgical instrument of claim 10, further comprising a third electrode connected to the distal end of the first electrode and having a body of revolution about the axis of the first electrode, wherein a second gap is provided between the third electrode and the conducting end.

12. The high-frequency electric knife according to claim 1, wherein the conducting terminal is a solid of revolution surrounding the outside of the first electrode.

13. The high-frequency electric knife according to claim 12, wherein the conductive member extends in a radial direction of the first electrode and is in sliding contact with the first electrode.

14. The high-frequency electric knife according to claim 12, wherein the conductive member is in contact with the first electrode and is rollable relative to the first electrode.

15. The high-frequency electrotome according to claim 14, comprising a plurality of the conductive members, which are uniformly distributed along the circumferential direction of the first electrode.

16. The high-frequency electric knife according to claim 1, 2 or 12, characterized in that the conductive member is in sliding contact and/or rolling contact with the first electrode.

17. The high frequency electrotome according to claim 1, wherein the second electrode further comprises a working end, the working end being located at a distal end of the insulating connector.

18. The electrosurgical blade according to claim 17, wherein the insulating connecting member is a solid of revolution about the axis of the first electrode, and the working end is located at the center of the distal end of the insulating connecting member.

19. The electrosurgical blade according to claim 17, wherein the insulating connection member is a solid of revolution about the axis of the first electrode, and the second electrode is a linear electrode and is offset from the center of the insulating connection member.